Press



Oct. 25, 1932.

A. W. PHELPS PRESS Filed June l.- 1929 4 Sheets- Sheet 1 0Ct. 25, 1932.w, PHELPS 1,884,198

PRESS Filed June 1. 1929 4 Sheets-Sheet 2 \w /0 0 "WA/ m 2 v 2 div; 1.Phelps 15 /a Milt m Oct. 25; 1932. A. w. PHELPS 1,884,198

PRESS Filed June 1, 1929 4 Sheets-Sheet 4 gwuwwtoc 7 dZva 1a Phel s awAway 44 Patented Oct. 25, 19 32 UNITED STATES PATENT OFFICE ALVA W.PHELPS, OF ANDERSON, INDIANA, ASSIGNOR TO DELCO-REMY CORPORATION,

F ANDERSON, INDIANA, A CORPORATION OF DELAWARE PRESS Application filedJune 1, 1929. Serial No. 367,818.

er lever and to ream the bushing after it has been pressed intoposition, thereby reducing the cost of production by saving labor, byproducing a more uniform product and by reducing the number of defectiveieces. This has been accomplished by provi ing' a plurality of sets ofsupports arranged in a dial, each set of supports comprising asupporting member for the bushing fixedly attached to the dial, afloating orresilient supporting pad or plate provided with clampsadapted to clamp a. circuit breaker lever in position. In the last namedsupport is provided an aperture in alignment with the support for thebushing into which the bushing is inserted. The circuit breaker leverhas a seat, comprising an aperture, for receiving and holding thisbushing. This aperture is in alignment with the aperture, in its supportwhen clamped in position so that as the dial is indexed by automaticallydriven means, a reciprocating cross head which carries an aligningmember, forces the circuit breaker and its support toward the bushingand its support so as to force the circuit breaker over the bushing.After this is done the dial is again indexed so that the clamped circuitbreaker lever has its bushing aligned with ,a reamer which automaticallyreams the bushing. Means have been provided for releasing the clamp forejecting the finished circuit breaker and for removing the wastematerial formed by the reamer. It can be readily seen that all that isnecessary for the operator to do is to insert the bushing and thecircuit breaker lever in their respective places.

Further objects and advantages of the pres- I ent-invention will beapparent from the following description, reference being had to the.

accompanying drawings, wherein a preferred embodiment of one form of thepresent invention is clearly shown.

In the drawings:

F 1 shows a side elevation of the device. Fig. 2 shows a plan view ofthe dial looklng in the direction of arrow 2 in Fig. 1-.

Fig. 3 is a sectional view taken on the line 3-3 of Figs. 2 and 4. I

F 4 is a sectional view taken on the line 44 of Figs. 2 and 3.

Fig. 5 is an enlarged fragmentary sectional view taken on the line 5-5of Fig. 2.

Fig. 6 is an enlarged fragmentary sectlonal view of a portion of thedial seen on the right of Fig. 3.

Fig. 7 is an enlarged fragmentary sectional View of a portion of thedial seen on the right of Fig. 4.

Fig. 8 is a detail view showing the reamer ustbefore finishing reamingof the bushing. F 1g. 9 is a detail plan View of the circuit breakersupport and clamps. Figs. 10 and 11 are detail views of the drivingmechanism.

Fig. 12 is a sectional View taken on the line 1212 of Fig. 11.

Fig. 13 is a sectional view taken on the line 1313 of Fig. 2.

Fig. 14 is a sectional View taken on the line l414 of Fig. 9.

Fig. 1 is drawn to a smaller scale than Figs. 24,. and 1044 inclusive.

Figs. 5-9 inclusive are drawn to a larger scale than the other figures.In the production of circuit breaker levers t is necessary to provide aninsulating bushng for the lever. One way of accomplishmg this 1s toprovide the circuit breaker lever with a bushing 22 made from bakeliteor a body of another phenol condensation product which provides a verygood bearing and at the same time a good insulator. The circuit breakerlever 20 carries a contact point 24 at one end of a channel shaped arm26, which has a web 28, and flanges and 32.

' Each of the flanges 30 and 32 are provided 40 may be omitted for sometypes of circuit breaker levers. As best seen in Figs. 6, 7 and 8 thebushing 22 is supported only at its ends by the flared portions 36 and38. From this structure it can be readily seen that it is necessary toguide the bushing as it is forced through the aperture so that thebushing will be properly aligned with respect to the flared edges 36 and38. If it were not thus guided, the bushing would in some cases, becomejammed without passing through the aperture in the flange 30.

In order to carry out this method. a dial comprising circular plates 50and 52, held in position by a pin or suitable stub shaft 54, threadedlyengaging a base 56, adapted to be mounted on the frame 58 of a punchpress having the frame 60, the upright 62 into which is journalled acrank shaft 64 carrying a fiy-wheel 66, and a reciprocating cross head68 connected to the crank shaft by aconnecting rod 70.

The circular plate 52 carries a plurality of equally spaced supportingsets each comprising a pin 72 extending into an aperture 74- in afloating or resiliently mounted plate or pad 76 to support the bushing22. The plate 7 6 carries a pin 7 8 upon which is pivoted a movableclamping member 80, cooperating with fixed clamping member 82 to supportand clamp the circuit breaker lever 20, as best seen in Fig. 5. Theplate 76 is provided with flanges 84 and 86 which cooperates with theshoulders 88 and 90 in a recess in the circular plate 50 to limit theupward movement of plate 7 6 by the springs 92' and 94, seated inrecesses in members 52 and 76. Intermediate the spring 92 and the plate76 is mounted a small circular plate 96 which supports a ball 98 locatedin a hole in plate 7 6 and engaging'a recess 100 or 102 in clamp 80 tohold it in clamped position or in open position. 1

It can be readily seen that as the bushing 22 is inserted in theaperture 74 while the set of supports 72 and 7 6 arein the positionindicated by A in Fig. 2, and the circuit breaker lever 20 clampedbetween members 80 and 82, the bushing 22 may be pressed into thecircuit breaker lever by moving the bush ing 22 upwardly or by movingthe circuit breaker lever 20 downwardly or by a rela?" tive movement ofboth the bushing 22 and are circuit breaker lever 20 toward each other.In this device the circuit breaker lever 20 is moved downwardly asviewed in Fig. 6, so as to press the bushing 22 into the circuit breakerlever 20.

After intermittently rotating the dial so that the circuit breaker lever20 is moved from position A, as best seen in Fig. 2, to position B by amechanism which will be described later, the circuit breaker lever 20 ispushed to the down position as best seen in Fig. 6 by a reciprocatingblock 104, attached to the cross head 68. The block 104 carries aresiliently mounted aligning pin 106 which has a reduced portion 107that cooperates with the aperture 74 to properly guide the bushing 22 asthe circuit breaker lever 20 is moved to the down position. The reducedportion 107 is limited in its movement into the bushing 22 by theshoulder 109. As the pin 106 is urged downwardly as seen in Fig. 6, by ahelical spring 111, the block 104 may advance downwardly after theshoulder 109 on the pin 106 engages the bushing 22. The supporting plate76, being resiliently mounted on the spring 92 and 94, moves downwardlywith the circuit breaker lever 20. In order to relieve the strain on thecircuit breaker lever 20, the block 104 cooperates with the clampingmembers 80 and 82 to move the floating plate 7 6 downwardly.

The plate 52 is prevented from exerting an undue pressure or force uponthe stub shaft 54 by an anvil or platen 108 attached to the base member56 by screws 110 as best seen in Fig. 3.

As the block 104 is raised fromthe down position disclosed in Fig. 6 tothe up position disclosed in Fig. 7, the circuit breaker lever 20 isprevented from being carried upwardly with the pin 106 by the clampingmember 80 which has an extension 112 extending between the flanges 30and 32 of the circuit breaker lever as best seen in Fig. 14.

The means for intermittently rotating the rotary dial consists of thelever 120 carrying a pivotally mounted pawl 124 having a detent.

126 which is biased towards the dial by a spring 128 seated in a recess130 and mounted on a pin 132 carried by a stud 133 mounted in the lever120. The dial is provided with U- shaped members 134 seated in recessesprovided therefor in the periphery of the dial.

Flexible means such as a rope or cable 136 passing over a pulley 142,has one end attached to the lever 120 by a pin 138 and to a weight 140.It can be readily seen that the lever 120 will be biased in acounterclockwise direction about the stub shaft 54 as viewed in Fig. 2by the weight 140. The lever 120 is rotated in a clockwise direction bya chain 144 passing under the pulley 146, having one end not shownattached to the reciprocating cross head and the other end attached tothe lever 120 through a turnbuckle 150. As the cross head 68 advancesdownwardly as viewed in Fig. 1, the lever 1.20 will be rotated in acounterclockwise direction as viewed in Fig. 2, the pawl 124 disengagingthe recess in the dial. As the cross head moves upwardly the lever 120is moved from the dot dash position 120a as disclosed in Fig. 2, to thefull line posi tion 120. As the lever 120 rotates in a clockwisedirection the detent 126. will engagethe U shaped member 134a, so as torotate the dial.

In order to prevent the dial from moving after it has been indexed andwhile the lever 120 rotates in a counterclockwise direction, a suitablemeans has been provided to lock the dial in position. This has beenaccomplished by a detent 152 carried on lever 154, pivoted at 156 andurged in a clockwise direction by a spring 158,'having one end attachedto a pin 160 carried by the base 56 and the other end attached to a pin162 carried by lever 154. Immediately before the detent 126 engages theU-shaped member 134a a dog 164 integral with the lever 120 strikes atrigger 166 pivotally mounted at 156, moving lever 154.

from the full line position to the dot dash position 154a as seen inFig. 2, by means of a shoulder 168 engaging a pin 170 carried by lever154, this permits the rotation of the dial by the detent 126. As thelever 120 is moved from a full line position to a dot dash position asseen in Fig. 2, member 164 engages the trigger 166 rotating it in aclockwise direction about the pivot 156 until the dog 164 clears thetrigger, when the trigger will be snapped back into the positiondisclosed in Fig. 2, by

' a spring 172 having one end attached to a pin 174 carried by the base56 and the other end attached to a pin 176 carried by the trigger 166.The spring 172 having suflicient tension to snap the trigger 166 backinto position, but not enough tension to remove the detent 152 from therecess 134.

A brake 180 urged towards the dial by a spring 182 has an arcuatesurface 184 engaging the dial to prevent it from rotating too freely. Asthe structure of this brake does not form a part of this invention adetailed descriptlon is omitted as this is found in my co pendingapplication for an assembling press Serial No. 324,340, filed December7, 1928.

When the circuit breaker lever and the bushing which has been rotatedfrom position B to position C as seen in Fig. 2 by the indexing meansfor intermittently rotating the rotary dial, the aperture through thebushing is reamed by a reamer 186 carried in a chuck 188 mounted on anddriven by the armature shaft of the motor 192 which is attached to thereciprocating cross head 68 so that as the cross head reciprocates, thereamer 186 will also reciprocate.

The bracket 194 attached to the base 56 is provided with an aperture 196which is in alignment with the aperture in the bushing when in positionC and directly above the bushing 22 so that the reamer is steadied bythis bracket and so that the bushing is not .pulled out of the seatprovided therefor in the circuit breaker lever. The bracket 194 preventsthe bushing from following the reamer as it is retracted from the downposition as viewed in Figs. 1 and 8.

As the support and the circuit breaker lever is routed from position Cto positionD by. the indexing means, the clamping lever 80 strikes atrigger orrelease 200 mounted on the base 56 so that the clamping lever80 will be opened in the open position by means of the spring urged ball98 engaging the recess 102. When in the position D the circuitbreaker-lever 20 is ejected from the clamping members by means of a jetof air from the pipe 204 connected to a source of compressed air,through a valve mechanism, not shown, which is opened momentarilyimmediately after the circuit breaker lever arrives at position D.Another pipe 206 connected to the same source of compressed air as thepipe 204 and controlled by the same valve mechanism removes dust andchips from the aperture 74 in the support 76 so that this aperture isready for another bushing when it arrives at position A.

A chute pipe 204 at position D so that 'as the circuit breaker lever 20and the bushing 22 is ejected through the chute 210 into a suitablereceptacle, not shown, provided therefor.

Operation At station A the operator inserts a bushing 22 made from abakelite or another phenol condensation product into aperture 74 so thatthe bushing 22 rests on the support 72 and is flush with the top ofplate 76 as best seen in Fig. 5. Then he places the circuit breakerlever 20 on the plate 76 so that the arm 26 carrying the contact 24extends into a recess 83 and the clamping member 82 so that the circuitbreaker lever 20 may be accurately positioned, then he moves clampingmember 80 from the dot dash positionshown in Fig.

apertures provided therefor in the circuit.

breaker lever 20 as best seen in Figs. 3 and 6. The reduced end 107 ofthe aligning pin 106 enters the bushing 22 so as to guide the bushing.As the block 104 is raised upwardbreaker lever 20 into the up positiondisclosed in Fig. 7. l

When the circuit breaker lever 20 and the bushing 22 arrives at stationC the aperture through the bushing is reamed by the reamer 186. Thebushing is prevented from following the reamer by the bracket 194 and bythe clamping members 80 and 82.

As the circuit breaker lever and its support moves from position C toposition D, the end of the clamping member 80 engages the trigger 200which opens the clamping member 80 so as to permit a blast of airemitting 210 is placed in alignment with the ly the bushing 22 will nowfollow the circuit t'rom the pipe 204 to eject the circuit breaker leverfrom its support through the chute 210. When the support arrives atposition E dust and chips which have accumulated in the aperture 74 ontop of the support 72 is removed by a blast of air from the pipe 206'.

This device has been shown in connection with the circuit breaker lever20 having aper tures for receiving the bushing 22. It is within thepurview of this invention to assemble the circuit breaker levers havingthe bushing pressed into some other seat than an aperture, as forexample, a pair of clamps.v With a slight modification this device may.be used for pressing or staking other parts than a bushing and itssupport.

While the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich low.

What is claimed is as follows: 1. A device for pressing the bushing intoa circuit breaker lever, said circuit breaker lea circuit breaker lever,said circuit breaker lever having an aperture for receiving and holdingthe bushing, comprising in combination, a resilient support for thecircuit breaker lever; 21- pair of clamping members mounted on saidresilient support holding ,the lever in position, means for supportingthe bushing; means for guiding the bushing into the aperture in thecircuit breaker lever;

and means for causing a relative movement between the 'circuitbreakerlever and the bushing to cause the bushing to be pressed into thecircuit breaker lever. i

3. In a device for securing a member to a second member provided with aseat for receiving and holding the first member means for guiding thefirst member while'approaching the seat in the second member and whileadvancing therein during assembly of the members.

4. A device for pressing the bushing into a circuit breaker lever, saidcircuit breaker lever having an aperture for receiving and holding thebushing, comprising in combination, means for holding the circuitbreaker lever and bushing in alignment; means for causing a relativemovement between the circuit breaker lever and the bushing so as to.fol- I the bushing in alignment.

force the bushing into the aperture; and means for guiding the bushingas it advances through the circuit breaker lever.

5. A device. for pressing the bushing into a circuit breaker lever, saidcircuit breaker lever having an aperture for receiving and holding thebushing, comprising in combination, means for holding the circuitbreaker lever; means for supporting the bushing; means for guiding thebushing into the aperture provided therefor in the circuit breakerlever; and means for causing a relative movement between the" circuitbreaker lever and the bushing to cause the bushing to be press fittedinto the lever, said last named means including means for guiding thebushing through the aperture.

6. A device for pressing the bushing into a circuit breaker lever, saidcircuit breaker lever having an aperture for receiving and holding thebushing, comprising in combination, means for supporting thebushing;-clamping means for holding the circuit breaker lever so thatthe bushing is in alignment with the aperture in the circuit breakerlever; means causing a relative movement of the bushing and the circuitbreaker lever so as to press the bushing into the lever; and means forguiding the bushing through the aperture in the circuit breaker lever soas to maintain 7. The method of pressing the bushing into a circuitbreaker lever,.said circuit breaker lever having an aperture forreceiving and holding the bushing, comprising the steps of the bushingis aligned with the aperture in the circuit breaker lever; clamping thecircuit breaker lever while thus positioned; causing a relative movementbetween the clamped circuit breaker lever and the bushing so as to pressthe bushing into the aperture provided therefor, and guiding the bushingexternally and internall while it advances through the aperture in t ecircuit breaker lever.

8. The method of pressing the bushing into a circuit breaker lever, saidcircuit breaker lever having an aperture for receiving and holding thebushing, comprising the steps of aligning the bushing and the aperturein the circuit breaker lever; clamping the circuit breaker lever whilethus aligned; causing a relative movement between the clamped cir-.

cuit breaker lever and the bushing so as to force the bushing into theaperture provided therefor; and guiding the entire internal cylindricalsurface of the bushing while it advances through the aperture in thecircuit breaker lever, and that portiorrof the external cylindricalsurface of thebushing which is not yet received by said aperture.

9. The method of ressing the bushing into a circuit breaker lever, saidcircuit breaker lever having an apertureior receiving and ,100positioning the circuit breaker lever and the i bush ng in apre-assembled relation so that holding the bushing, comprising the ste sof ositioning the circuit breaker ever an the ushing in a preassemblystation so that the bushing is in axial alignment with the aperture inthe circuit breaker lever; moving the circuit breaker lever and thealigned bushing to an operating station; pressin the bushing into theaperture of the circuit reaker lever while in sa'idoperating station,and guiding the bushing externally and internally while itadvancesthrough the aperture of the circuit breaker lever. I 10. The method ofpressing the bushing into a support, said support having an aperture forreceiving and holding the bushing, comprising the steps of positioningthe support and bushing in a preassembly station so that the bushing isin alignment with the aperture in the support; clamping the supportwhile in the preassembly station; moving the clampedsupport and thealigned bushing to an operating station; pressing the bushing into theaperture provided therefor, while in said operating station, and guidingthe entire internal cylindrical surface of the bushing while it advancesthrough the aperture in the circuit breaker lever, and that ortion ofthe external cylindrical surface '0 the bushing which is not yetreceived by saidaperture. y

11. The method of pressing the bushing into a'circuit breaker lever andof reaming the bushing after being pressed into the circuit breakerlever, said circuit breaker lever being provided with a recess toreceive the bushing comprising, the steps of arranging the circuitbreaker lever and the bushin in a pre-assembled relation so that thebushing is tion, a support for the bushing; a resilientlymounted supportfor the circuit breaker lever; means for moving the resilientlymountedsupport to an operating position; and means for causing arelative movement between the circuit breaker lever and the bushing soas to press the bushing into the aperture provided therefor.

13. A device for pressing the bushing into a circuit breaker lever, saidcircuit breaker lever havingan aperture for receiving and holding-thebushing, com rising in combination, a support for the ushing; clampingmeans for holding the circuit breaker lever in a pre-assembled relationwith respect to the bushing on the support; means for locking saidclamping means in a clamped position;

means for ressing the bushing into the aper- I ture provi ed therefor;and a trigger for releasing said clamping means after the bushing hasbeen pressed into the circuit breaker lever.

14. A device for pressing the bushing into a circuit breaker lever, saidcircuit breaker lever having an aperture for receiving and holding thebushing, comprising in combination, means for supporting the bushing;clamping means for holding the circuit breaker lever in a pre-assembledrelation with respect to the bushing on the circuit; means for lockingsaid clamping means in a clamped position; means for pressing thebushing into the aperture provided therefor; a trigger for releasin saidclamping means after the bushing has been pressed into the circuitbreaker lever; and means for ejecting said assembled circuit breakerlever from said clamping means.

15. A device for pressing a member into a. seat provided therefor in asecond member, comprising in combination,-a floating support forsupporting one of said members; means for supporting the other of saidmembers; and reciprocating means for causing a relative movement betweensaid members so as to press said second member into the seat providedtherefor in said first member.

16. A device for pressing the bushin into a circuit breaker lever andreaming the ushing after being pressed into the circuit breaker lever,said circuit breaker lever being provided with a recess to receive thebushing, comprising in combination; a conveyor for supporting thecircuit breaker lever, means for pressing the bushing into the recessprovidedby the circuit breaker lever, means for reaming the bushing; anda bodily movable means carrying the means for pressing the bushing intothe recess provided by the circuit breaker lever and the means forreaming the. bushing.

i 17. A device for pressing the bushing into a circuit breaker lever andreaming the bushing after being pressed into the circuit breaker lever,said circuit breaker lever being provided with a recess to receive thebushing, comprising in combination; a conveyor for. supporting thecircuit breaker lever, means for pressing the bushing into the recessprovided by the circuit breaker lever, means for reaming the bushing;and a bodily movable means for supporting both of last said means so asto impart concurrent operative movements to them.

18. The method of pressing a bushing into a circuit breaker lever andreaming-the bushing after being pressed into the'eircuit breaker lever,said circuit breaker lever being provided with a recess to receive thebushing, comprising the steps of arranging the circuit breaker lever andthe bushing ina' preassembled relation at a loading station of a vconveyor; intermittently moving the conveyor so as to convey the circuitbreaker lever and its preassembled bushing from said loading station toa press fitting station and to convey an assembled circuit breaker leverfrom said press fitting station to a reaming station for reaming theaperture of the press fitted bushing, and intermittently moving of meanscarrying the means for pressing abushing into a circuit breaker leverand the means for reaming the press-fitted bushing so as to impartconcurrent operative movements to both of last said means.

19. The method of pressing a bushing into a circuit breaker lever andreaming the bushing after being pressed into the circuit breaker lever,said circuit breaker lever being provided with a recess to receive thebushing, comprising the steps of; arranging the circuit breaker leverand the bushing in a pleassembled relation at a loading station of aconveyor; intermittently moving the conveyor so as to convey the circuitbreaker lever and its preassembled bushing from said loading station toa press-fitting station and to convey an assembled circuit breaker leverfrom said press-fitting station to a reaming station for reaming theaperture of the press-fitted bushing, intermittently moving of meanscarrying the means for pressing a bushing into a circuit breaker leverand the means for reaming the press-fitted bushing so as to impartconcurrent operative movements to both of last said means, and guidingthe bushing aft- .er it advances through the circuit breaker lever soas; to maintain the bushing in ali ninent with the aperture of thecircuit brea. er

ever.

20. The method of pressing a bushin into a circuit breaker lever andreaming the ushing after being pressed into the circuit breaker lever,said circuit breaker lever being provided with a recess to receive thebushing, comprising the steps of; arranging the circuit breaker leverand the bushing in a preassembled relation at a loading station of aconveyor clamping the circuit breaker lever while in said preassembledrelation; intermittently moving the conveyor so as to convey the circuitbreaker lever and its preassembled bushing from said loading station toa press-fitting station and to convey an assembled circuit breaker leverfrom said pressfitting station to a reaming station for reaming theaperture of the press-fitted bushing, and intermittently moving of meanscarrying the means for pressing a bushing into a circuit breaker leverand the means for reaming the press-fitted bushing so as to impartconcurrent operative movements to both of the last said means.

21. A device for pressing the bushing into a circuit breaker lever andfor reaming the bushing after being press-fitted into the circuitbreaker lever, said circuit breaker lever 1,ss4,1es

ing is in alignment with the a erture in the circuit breaker lever;means or effecting a relative movement of the bushing and the circuitbreaker lever so as to press the bushing into the circuit breaker lever,means for reaming the bushing after it has been pressfitted into thecircuit breaker lever; and reciprocatory means carrying both last saidmeans and imparting concurrent operative movements to them.

22. A device for pressing a bushing into a circuit breaker lever and forreaming the bushing after being pressed into the circuit breaker lever,said circuit breaker lever being provided with a recess to receive thebushing; comprising in combination, means for supporting the circuitbreaker lever and the bushing in a preassembled relation; means forpressing the bushing into the aperture pro vided therefor, means forreaming the bushing after it has been press-fitted into the circuitbreaker lever, reciprocating means for imparting to both of last saidmeans concurrent operative movements, and means for ejecting saidcircuit breaker lever from said support after it has been reamed.

23. A device for pressing a bushing into the aperture of a circuitbreaker lever comprising, in combination, a movable support for thecircuit breaker lever, said support having an aperture for slidablyreceiving a bushing; a stop for said support; springs normallymaintaining the support in engagement with the stop; a stationaryplunger engaged by that end of the bushing in the aper ture of thesupport which is remote from a supported circuit breaker lever; means onthe support for locating a circuit breaker lever so as to be coaxiallyaligned with the bushing; a movable ram for moving the circuit breakerlever and therewith the support relative to the bushing whereby thelatter advances into the aperture of the circuit breaker lever; and apilot pin carried by the ram and projecting into the bore of thebushingprior to its advance into the aperture of the circuit breakerlever and during the advance therein.

24. A device for pressing a bushing into the aperture of a circuitbreaker lever comprising, in combination, a circuit breaker leversupport having an aperture for s1idably receiving a bushing, saidsupport being movable parallel to the axis of the bushing; a stop forsaid support; springs normally maintaining the support in engagementwith the stop; a stationary plunger projecting into the aperture of thesupport and engaged by that end of the bushing which is remote from asupported circuit breaker lever; means on the support for locating acircuit breaker lever so as to be coaxially aligned -With the bushing; amovable ram for moving the cir cuit breaker lever and therewith thesupport relative to the bushing whereby the latter advances into theaperture of the circuit breaker lever; and a pilot pin yieldinglycarried by the ram and movable coa-Xially of the bushing, said pilot pinextending into the bushing prior to its advance into the aperture of thecircuit breaker lever and during the advance therein.

In testimony whereof I hereto aflix my signature.

ALVA W. PHELPS.

